CloverBootloader/MdePkg/Library/BaseMemoryLibRepStr/X64/SetMem.nasm

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NASM
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;------------------------------------------------------------------------------
;
; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
;
; SetMem.Asm
;
; Abstract:
;
; SetMem function
;
; Notes:
;
;------------------------------------------------------------------------------
DEFAULT REL
SECTION .text
;------------------------------------------------------------------------------
; VOID *
; EFIAPI
; InternalMemSetMem (
; IN VOID *Buffer,
; IN UINTN Count,
; IN UINT8 Value
; )
;------------------------------------------------------------------------------
global ASM_PFX(InternalMemSetMem)
ASM_PFX(InternalMemSetMem):
push rdi
mov rax, r8 ; rax = Value
mov rdi, rcx ; rdi = Buffer
xchg rcx, rdx ; rcx = Count, rdx = Buffer
rep stosb
mov rax, rdx ; rax = Buffer
pop rdi
ret